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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38835ddd82e6860fbdc772b5bc31d183fa010700f777be4c9dfc10aa5ee9991f' 
  AND token = 'ffk5mwY4MTVg65l1w6llt76A6h7UbkrF0VQjgr3HseM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}